12'r 



Fasciolaria nodulosa, but the apices of the spire, and the apertures of both 

 were theu completely buried in the rock, and the characters of the species 

 were very imperfectly understood. The matrix has since been removed 

 from both, and the spire has been found to be rather longer than it was 

 first supposed to be; the aperture of one specimen, also, has been cleared 

 sufficiently to expose the teeth and plaits on the columella; the pi*esence 

 of the latter was previously inferred from the shape and sculpture of the 

 exterior. The outer lip of both is imperfect. 



The original of figure *7 on plate 15, which was obtained by Mr. Rich- 

 ai'dson in 1874, at the Sucia Islands, from Division A., fortunate!}^ has 

 the outer lip well preserved, and its expanded, varix-like shape shows 

 that the shell belongs to the Tritoniidoe, rather than to the Fasciolarimce. 



There is no necessity for changing the specific name "nodulosa," 

 although it was previous!}^ applied to a Miocene Fasciolaria from North 

 Carolina by Dr. Emmons, in 1858, for the present species is almost 

 certainly a Hindsia, in the sense in which that genus is now accepted 

 by most palaeontologists, 



CiRSOTREMA TENUISCULPTUM. (N. Sp.) 

 Plate 16, figures 3, 3a, 36 and 3c. 



Shell elongafe-conical ; spire turreted, about equal in length to the 

 body whorl; test thin. Whorls seven, those of the spire convex, with 

 deep sutures ; body whorl ventricose, with a small umbilical perforation 

 at its base; aperture unknown. 



Surface marked by minute, flattened, revolving ridges, which have a 

 beaded aspect when viewed under a lens, in consequence of their being 

 crossed by still more minute and crowded, transverse, raised lines. The 

 revolving ridges are unequal in size, some being both broader and higher 

 than others, but the larger ones are most numerous on the lower jsart of 

 the upper whorls and on the middle of the last volution. There are 

 about twelve of these ridges on the last whorl but one, five of which are 

 larger than the rest, and on the body whorl there are about thirty, ten 

 of which are comj^aratively large, and the remainder small. The 

 transverse, raised lines extend from suture to suture. Near the middle 

 of the outer whorl there is a narrow, very slightly elevated, transverse 

 varix, or arrest of growth, which marks the position of a previous outer 

 lip and to some extent indicates its outline. 



Length of the onlj^ specimen not quite six lines ; maximum convexity 

 of the body whorl rather more than three lines. 



Sucia Islands, in Division A. ; J. Eichardson, 18*74. 



